turbo ????

ok sorry been a while guys the turbo is a holset hx55....i know they are used at diff. power levels on trucks.. my truck can be turned up to 475 with no problem of the turbo but the motor itself.. so what kinda power can this thing make on a 400 big block:D:D got a buddy thats thinking of trying it out.. i have no idea about boost:banghead::banghead::banghead::banghead: but a little on nos lol